A:①②③
B:①②④
C:①③④
D:②③④
____ Sam ____ a good time last Saturday?
患者出现浑身乏力、头晕等症状,可能是由于缺乏哪类无机盐引起的?( )
若方程组3x+2y=m+14x+3y=m-1的解满足x>y,则m的取值范围是 ( )
——Are you _______ American or English?
——English. We both work in Shanghai.